I've found a couple colonies, but I don't dig colonies up.
Their flights (according to the AntsCanada video) occur between June and the start of September, but while I've been in NV, I've seen ants fly much later in the year than he predicted.
So, if we get a rain here around the start of September, I bet there will be a pheidole flight.
Also, (though they are the hardest ants to keep in the area) pogonomyrmex have flights all the way til October and they can't climb glass very well! So keep an eye out for those! BUT make sure when you put them in their test tube, you hide them for at least a month before checking on them, maybe more. I've had some get eggs pretty far, then I checked on them and they freaked out and ate all their eggs. Pretty sad stuff.
Good luck!

Camponotus semitestaceus queens are out! Found 7 in my back yard tonight! 2 of the 3 that I got last year have nanitics. Gonna keep 4 of these, since they're polymorphic.
Anyone find a pogonomyrmex queen yet? I'm gonna go looking for those tomorrow, since I found a lot of them at this time last year.